<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png">
      </div>

      <!-- 登录表单区域 -->
      <el-form :model="loginFrom" ref="loginFromRef" :rules="loginFromRules" label-width="0px" class="login_from">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginFrom.username" prefix-icon="iconfont icon-yonghu"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginFrom.password" type="password" 
          prefix-icon="iconfont icon-mima"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <!-- disabled 是禁用方法 -->
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginFrom" >重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 这是登录表单的数据绑定对象
      loginFrom: {
        username: 'admin',
        password: '123456'
      },
      // 登录表单的验证规则对象
      loginFromRules: {
        // 验证用户名是否合法
        username:[
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password:[
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods:{
    // 登录方法
    login(){
      // 登录预验证（validate）拿到ref的对象即可
      this.$refs.loginFromRef.validate(async (valid) => {
        if(!valid) return;
        const {data: res} = await this.$http.post("login", this.loginFrom);
        console.log(res)
        if(res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')

        // 将登录成功之后的token，保存到客户端的 sessionStorage 中
        // token 只应在当前网站打开期间生效，所以将token保存在 sessionStorage 中
        window.sessionStorage.setItem('token', res.data.token)

        // 跳转到主页，
        this.$router.push('/home')
      })
    },
    // 点击重置按钮，重置登录表单
    resetLoginFrom(){
      this.$refs.loginFromRef.resetFields()
    }
  }
}
</script>

<style scoped>
/* lang="less" */
.login_container{
  background-color: #2b4b6b;
  height: 100%;
}

.login_box{
  width: 450px;
  height: 300px;
  background-color: white;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);  
}

.login_box .avatar_box{
  background-color: white;
  width: 130px;
  height: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
}

.login_box .avatar_box img{
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #eee;
}

.login_from{
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns{
  display: flex;
  justify-content: flex-end;
}

</style>

